I'm pretty certain that Rainboe, like most experienced jet pilots is aware that, when flying in the proximity of convective systems, anvils and the like, all bets re icing are off and whilst I may not (manually for some types) switch on the engine anti-icing I'd be keeping an eye on the parameters.
A lot of the published material is engine specific, e.g. FAA document which refers to <<B767 & B747 aircraft fitted with GE CF6-80C2 and CF6-80A engines >> I note punkalouver's post also refers to P&W.
p.s. Rainboe, that's a pint you owe me
